﻿#region Copyright & License Information
/*
 * Copyright 2007-2017 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Drawing;
using OpenRA.Effects;
using OpenRA.Graphics;
using OpenRA.Mods.Common.Graphics;

namespace OpenRA.Mods.MW.Effects
{
    public class FloatingTextBackwards : IEffect, IEffectAboveShroud
    {
        static readonly WVec Velocity = new WVec(0, 0, 86);

        readonly SpriteFont font;
        readonly string text;
        Color color;
        int remaining;
        WPos pos;

        public FloatingTextBackwards(WPos pos, Color color, string text, int duration)
        {
            font = Game.Renderer.Fonts["TinyBold"];
            this.pos = pos + Velocity * duration;
            this.color = color;
            this.text = text;
            remaining = duration;
        }

        public void Tick(World world)
        {
            if (--remaining <= 0)
                world.AddFrameEndTask(w => w.Remove(this));

            pos -= Velocity;
        }

        public IEnumerable<IRenderable> Render(WorldRenderer wr) { return SpriteRenderable.None; }

        public IEnumerable<IRenderable> RenderAboveShroud(WorldRenderer wr)
        {
            if (wr.World.FogObscures(pos) || wr.World.ShroudObscures(pos))
                yield break;

            // Arbitrary large value used for the z-offset to try and ensure the text displays above everything else.
            yield return new TextRenderable(font, pos, 4096, color, text);
        }

        public static string FormatCashTick(int cashAmount)
        {
            return "{0}${1}".F(cashAmount < 0 ? "-" : "+", Math.Abs(cashAmount));
        }
    }
}
